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Thermal Sciences 2004. Proceedings of the ASME - ZSIS International Thermal Science Seminar II
June, 13-16, 2004, Bled, Slovenia

DOI: 10.1615/ICHMT.2004.IntThermSciSemin


ISBN Print: 978-9-61913-930-1

Convective Heat Transfer Inside Rotational Cascades With Flat Blades

pages 807-814
DOI: 10.1615/ICHMT.2004.IntThermSciSemin.1010
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Краткое описание

A numerical approach enabling studying the influence between rotational speed and convective heat transfer of bladed structure is presented. The investigated structure, which is cooled by air, was subjected to an axial hot-air stream in a cross-flow system. In order to exclude the influence of undesirable aerodynamic flow forces, a simplified geometry was chosen, and the influence of varying rotational speed was studied. The distributions of heat transfer rate on the hot side of the structure's wall were determined with CFD calculations. The non-uniformity of heat transfer increases with rotational speed due to the increasing impact of centrifugal flow forces on the boundary-layer thickness. The impact of rotational speed on the heat transfer rate was found not to be significant. The results of the studied structure were also used to validate various one-dimensional, semiempirical, convective heat transfer models that are commonly applied in engineering praxis. In all cases the flat wall heat transfer treatment showed the best agreement with the results of the CFD calculations. In order to verify the numerical and semiempirical model a test rig was installed, where the influence of rotation and coolant mass flow ratio on heat transfer can be studied.

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